Disable testing when using BUILD_TESTING

Author: pfultz2

CMakeLists.txt

@@ -25,8 +25,9 @@ if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
   set(PYBIND11_MASTER_PROJECT ON)
 endif()
 
+option(BUILD_TESTING "Build test suite?" ${PYBIND11_MASTER_PROJECT})
 option(PYBIND11_INSTALL "Install pybind11 header files?" ${PYBIND11_MASTER_PROJECT})
-option(PYBIND11_TEST    "Build pybind11 test suite?"     ${PYBIND11_MASTER_PROJECT})
+option(PYBIND11_TEST    "Build pybind11 test suite?"     ${BUILD_TESTING})
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/tools")